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I have never found them harsh unless pointed directly at me when there can be a slight upper-mid zing. Toed out a little they are very smooth and can be listened to loud for long periods without fatigue.

No, the Chatsworth was fitted with Monitor Red to start with, then Monitor Gold, then for a very short period HPD 315, prior to being superceded by the Cheviot.

SGM, LRM, SRM, dual concentrics etc. are of a different, later family of drive units, with very different crossover.

The Monitor Gold Chatsworth is the most common variant and was a very nice speaker. It is best just lightly upgraded with modern capacitors in the crossover, better internal cabling and a clean up of the tweeter level and roll-off switch contacts with lubricating switch cleaner (always test on a small area of plastic first as some react).

They will sound a little different to the Chatsworths, as they have the truncated horn assembly used with the ceramic magnet, but they will no doubt sound as superb as the 3128 Cheviots I'm refurbishing as they use a slightly different version of the same driver.